Enhanced Crystallinity of Triple-Cation Perovskite Film via Doping NH4SCN

Ziji Liu, Detao Liu, Hao Chen, Long Ji, Hualin Zheng, Yiding Gu, Feng Wang, Zhi Chen, Shibin Li

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The trap-state density in perovskite films largely determines the photovoltaic performance of perovskite solar cells (PSCs). Increasing the crystal grain size in perovskite films is an effective method to reduce the trap-state density. Here, we have added NH4SCN into perovskite precursor solution to obtain perovskite films with an increased crystal grain size. The perovskite with increased crystal grain size shows a much lower trap-state density compared with reference perovskite films, resulting in an improved photovoltaic performance in PSCs. The champion photovoltaic device has achieved a power conversion efficiency of 19.36%. The proposed method may also impact other optoelectronic devices based on perovskite films.

Original languageEnglish
Article number304
JournalNanoscale Research Letters
Volume14
Issue number1
DOIs
StatePublished - 2019

Bibliographical note

Publisher Copyright:
© 2019, The Author(s).

Keywords

  • Crystalline
  • NHSCN
  • Perovskite solar cells
  • Trap-state density

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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